1. Adelman, C. (1999). Answers in the toolbox: Academic intensity, attendance patterns, and bachelor’s degree attainment. Washington, DC: National Center for Education Statistics, U.S. Department of Education.
2. Ashton, M. C., Lee, K., Perugini, M., Szarota, P., de Vries, R. E., Di Blas, L., Boies, K., & De Raad, B. (2004). A six-factor structure of personality-descriptive adjectives: Solutions from psycholexical studies in seven languages. Journal of Personality and Social Psychology, 86, 356–366.
3. Association of American Colleges and Universities (2005). Liberal education outcomes: A preliminary report on student achievement in college. Washington, DC: Author.
4. Astin, A. W. (1991). Assessment for excellence: The philosophy and practice of assessment and evaluation in higher education. Westport, CT: American Council on Education/Oryx Press.
5. Astin, A. W. (1993). What matters in college: Four critical years revisited. San Francisco, CA: Jossey-Bass.